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Address post-commit review for rL228587: make it explicit that the

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<NW> bit of a SCEVAddRecExpr does not depend on the sign of the step
and the start value of the step.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228595 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sanjoy Das 2015-02-09 19:39:00 +00:00
parent e17141f9f3
commit c253e7fe56
1 changed files with 2 additions and 1 deletions

3
include/llvm/Analysis/ScalarEvolution.h

@ -87,7 +87,8 @@ namespace llvm {
/// unsigned-max(bitwidth). This means that the recurrence will never reach
/// its start value if the step is non-zero. Computing the same value on
/// each iteration is not considered wrapping, and recurrences with step = 0
/// are trivially <NW>.
/// are trivially <NW>. <NW> is independent of the sign of step and the
/// value the add recurrence starts with.
///
/// Note that NUW and NSW are also valid properties of a recurrence, and
/// either implies NW. For convenience, NW will be set for a recurrence